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                [Usaco2005 Mar]Yogurt factory                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p>The cows have purchased a yogurt factory that makes world-famous Yucky Yogurt. Over the next N (1 &lt;= N &lt;= 10,000) weeks, the price of milk and labor will fluctuate weekly such that it will cost the company C_i (1 &lt;= C_i &lt;= 5,000) cents to produce one unit of yogurt in week i.  Yucky's factory, being well-designed, can produce arbitrarily many units of yogurt each week.  Yucky Yogurt owns a warehouse that can store unused yogurt at a constant fee of S (1 &lt;= S &lt;= 100) cents per unit of yogurt per week. Fortuitously, yogurt does not spoil.  Yucky Yogurt's warehouse is enormous, so it can hold arbitrarily many units of yogurt.  Yucky wants to find a way to make weekly deliveries of Y_i (0 &lt;= Y_i &lt;= 10,000) units of yogurt to its clientele (Y_i is the delivery quantity in week i). Help Yucky minimize its costs over the entire N-week period. Yogurt produced in week i, as well as any yogurt already in storage, can be used to meet Yucky's demand for that week.</p>
<p></p>
<p>吨酸奶。酸奶的生产受到很多因素的影响，所以每个月的生产成本是变化的，其中第 i 个月的成本是</p>
<p>每吨 Ci 元。</p>
<p>奶牛可以提前里把酸奶做好，存在仓库里，等需要的时候再拿出来卖。存储在仓库里的酸奶，每</p>
<p>吨酸奶存放一个月需要支付 S 元的维护费用，存放的时间可以任意长。假设工厂的产量是无限的，存</p>
<p>储酸奶的仓库也是无限大的。请问为了满足订单的需要，奶牛生产这些酸奶最少要花多少钱？</p></p><hr/><h3>输入格式</h3><p><p>* Line 1: Two space-separated integers, N and S.</p>
<p>&nbsp;* Lines 2..N+1: Line i+1 contains two space-separated integers: C_i         and Y_i.</p>
<p></p>
<div>&bull; 第一行：两个整数 N 和 S，1 &le; N &le; 10000, 1 &le; S &le; 100</div>
<div>&bull; 第二行到第 N + 1 行：第 i + 1 行有两个整数 Ci 和 Ai，1 &le; Ci &le; 5000, 1 &le; Ai &le; 10000</div></p><hr/><h3>输出格式</h3><p><p>* Line 1: Line 1 contains a single integer: the minimum total cost to         satisfy the yogurt schedule.  Note that the total might be too         large for a 32-bit integer.</p>
<p>&bull; 单个整数：表示生产酸奶的最小总费用</p></p><hr/><h3>样例输入</h3><pre>4 5
88 200
89 400
97 300
91 500
</pre><hr/><h3>样例输出</h3><pre>126900

OUTPUT DETAILS:
第一个月生产 200 吨酸奶；第二个月生产
700 吨酸奶，并存下 300 吨；第三个月不生产酸
奶；第三个月生产 500 吨</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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